iSeries Model 840 189
iSeries Model 840
Main Storage
All main storage cards on the Model 840 must be added in sets of four (quads) of the same
capacity and technology. There are 16 slots available for main storage cards in the Model
840. The slots are arranged in groups of four: AAAA, BBBB, CCCC, and DDDD. The plugging
order for the main storage cards is AAAA, BBBB, CCCC, and then DDDD.
There are no rules regarding the placement of a particular size of main storage card quad
into a card slot group. A quad of any size main storage card may be placed in any of the four
groups of four slots.
The available main storage features are as follows:
• #3196 - 8192 MB Main Storage Card (256 Mb technology)
• #3612 - 1024 MB Main Storage Card (256 Mb technology, replaces the #3197)
• #3613 - 2048 MB Main Storage Card (256 Mb technology, replaces the #3198)
• #3614 - 4096 MB Main Storage Card (256 Mb technology, replaces the #3195)
The #3196 requires the #2730 Programmable Regulator (quantity two) and may be selected
only to achieve main storage increments greater than 65536 MB.
Power and Packaging
The Model 840 includes an internal battery that is automatically activated in the event of
utility power loss. The battery provides full operating power for a short time to all components
within the system unit, but not to any external components. This can allow the system to run
uninterrupted for a short time (30 seconds or less). For longer power outages, the system
uses the battery to attempt an orderly shutdown to avoid losing data in main storage that is
not written to disk. An external UPS is recommended to protect the system unit and any
external components against utility power outages. Continuously Powered Mainstore (CPM)
is not supported on the Model 840. An external UPS can allow the system to run
#2461
#1540 #26D0 P40
#1541 #26D1 P50
#1542 #26D2 P50
#1543 #26D3 P50
#1544 #26D4 P50
#1545 #26D5 P50
#1546 #26D6 P50
#1547 #26D7 P50
#1548 #26D8 P50
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